I agree that raw population grow is not a sustainable solution, but at least you need to grow at the replace rate or you're in trouble.
Care for the elderly is still an intensive task. Maybe yes, in 30 years it will be done by (Japanese) robots but we're not close yet.
You have the economic burden too: how much more productive each working individual has to be if it has to offset an increased ration of non working individuals?
Lastly, I don't think a country is sustainable with a dwindling population unless it can be physically and culturally isolated and has an important deterrent against military action
Care for the elderly is still an intensive task. Maybe yes, in 30 years it will be done by (Japanese) robots but we're not close yet.
You have the economic burden too: how much more productive each working individual has to be if it has to offset an increased ration of non working individuals?
Lastly, I don't think a country is sustainable with a dwindling population unless it can be physically and culturally isolated and has an important deterrent against military action